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- W1685396947 abstract "In this paper, we predict the existence of low-frequency nonlocal plasmon excitations at the vacuum-surface interface of a superlattice of $N$ graphene layers interacting with a thick conducting substrate. This is different from graphite which allows inter-layer hopping. A dispersion function is derived which incorporates the polarization function of the graphene monolayers (MLGs) and the dispersion function of a semi-infinite electron liquid at whose surface the electrons scatter specularly. We find that this surface plasmon-polariton is not damped by the particle-hole excitations (PHE's) or the bulk modes and separates below the continuum mini-band of bulk plasmon modes. For a conducting substrate with surface plasmon frequency $omega_s=omega_p/sqrt{2}$, the surface plasmon frequency of the hybrid structure always lies below $omega_s$. The intensity of this mode depends on the distance of the graphene layers from the surface of the conductor, the energy band gap between the valence and conduction bands of MLG and, most importantly, on the number of two-dimensional (2D) layers. Furthermore, the hybrid structure has no surface plasmon for a sufficiently large number ($Nstackrel{>}{sim} 7$) of layers. The existence of two plasmons with different dispersion relations indicates that quasiparticles with different group velocity may coexist for various ranges of wavelength which is determined by the number of layers in the superlattice." @default.
- W1685396947 created "2016-06-24" @default.
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- W1685396947 date "2015-08-08" @default.
- W1685396947 modified "2023-10-18" @default.
- W1685396947 title "Environmental Effects on the Terahertz Surface Plasmons in Epitaxial Graphene" @default.
- W1685396947 hasPublicationYear "2015" @default.
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